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The styrene oxidation activity of cytochrome P450cam, has been greatly improved by rational protein engineering. Compared to the wild-type enzyme, the active-site mutants Y96A and Y96F bound styrene more tightly, consumed NADH more rapidly, and were more efficient at utilising reducing equivalents for product formation. Styrene oxide formation rates were enhanced 9-fold in the Y96A mutant relative to wild-type, and 25-fold in the Y96F mutant, thus demonstrating the effectiveness of active-site redesign in improving the activity of a haem monooxygenase towards an unnatural substrate.
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Nickerson et al. (1997) studied this question.
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